Watch Katy Perry Perform "Teenage Dream" on Letterman

Posted mostly for the purpose of sending you in the direction of Ryan Dombal's stellar review of Teenage Dream in this week's Voice. "Perry herself is the dream," writes Dombal, about this particular song. (Topics also covered: Perry's secret fetish-message-board agenda, what happens when you summit Fame Mountain, Lisa Simpson sax solos, the singer's sincere desire to have her ashes spread across the sky, and what it is to be the goofiest human being currently working in pop music.) Letterman, whose reviews of his guests' performances tend to be instantaneous and sometimes devastating, seems...aroused. Easy, Dave.